Select from each group the species which has the smallest radius stating appropriate reason
`O, O^(-), O^(2-)`

Explanation

To determine which species has the smallest radius among \( O \), \( O^{-} \), and \( O^{2-} \), we can follow these steps:

### Step 1: Understand the Species
- We have three species to compare:
- \( O \) (neutral oxygen atom)
- \( O^{-} \) (oxide ion with one extra electron)
- \( O^{2-} \) (oxide ion with two extra electrons)

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